GH Booster – Generic


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Item Amount: 70 grams


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This GH booster can be used in both low tech (non Co2 injected) and high tech (Co2 injected) aquariums. Note: it is not to be used with our Dry Fert For the Co2 aquarium as we have a specific GH booster to use with that instead. Click here to purchase the GH booster to go with dry fert for Co2 Aquarium or click here to purchase Dry Fert for Low Tech (Non-Co2 Aquarium)

First thing you need to do is determine whether you even need to raise the GH in your aquarium, as some people live in areas where the tap water (water used to fill aquarium) has an extremely high GH. A quick GH test of your tap water will determine whether you should dose some GH booster. For the record, GH 3 (53.7ppm) and below we recommend dosing GH booster. You should use your GH booster along side your chosen fertiliser and carbon dosing regime. GH booster is not a complete fertiliser on its own, it is an additive to increase GH (calcium and magnesium levels). This product will not raise your PH. 

DIRECTIONS based on 50L aquarium: 

50 Litre Aquariums +/- 1/8 tsp (a couple pinches) of GH booster once a week (dose on the day you do your once a week 20-50% water change). If you are not going to do a water change after 1 week then there is no need to re-dose GH booster. 

Note: If GH is 2 or below then you can add a little more than 1/8th tsp. Dosing doesn’t need to be 100% exact as this method is based on the Estimative Index Dosing Method. Calculate aquarium size based on the 50L dosing instructions and the math is simple. For example 100L + / – 1/4 tsp and so fourth. For the record, I dose a teaspoon in my 300L high light Co2 injected aquarium with a GH of 2 and that is sufficient. A little more would not hurt if I were to be slightly heavy handed in my dosing. If your plants are still showing signs of calcium and magnesium deficiency (see ‘Function of Calcium’ and ‘Function of Magnesium’ below) then gradually increase your dosing over the course of a month. Doubling the dosage would not cause any harm to aquatic life or plants, but it’s always best to start out small and gradually increase dosage amount if you feel the need, as a sudden change in parameters can sometimes cause plant leaves to melt away (leaves disintegrate but roots stay intact) and re-grow again as they adjust to the new GH, particularly cryptocoryne species.WHEN DOSING PUT THE DESIRED AMOUNT INTO A WATER TIGHT CONTAINER (WITH SOME WATER) AND SHAKE, THEN TIP INTO AQUARIUM. WATER WILL GO A LITTLE CLOUDY BUT WILL DISSIPATE WITHIN HALF AN HOUR ONCE GH BOOSTER DISSOLVES. DO NOT MIX YOUR GH BOOSTER IN WITH YOUR FERTILISERS. YOU KEEP YOUR GH BOOSTER IN DRY POWDER FORM AND MIX UP ONCE A WEEK SEPARATELY. 

Now bare in mind you will only be dosing this once a week on the day you do your water change. The water change resets the tank by eliminating any dissolved salt build up from the use of fertilisers, not to mention tap water already contains a certain level of total dissolved salts (TDS). If you are not going to do a water change after 1 week then there is no need to re-dose GH booster.

Additional Information: This GH booster will boost calcium and magnesium levels as well as deliver a slight top up of potassium, which is beneficial if you have plants such as Echinodorus species coming into flower, as the added boost in potassium is needed when plants move into the flowering/reproductive stage. When plants are in the vegetative state (which is essentially what most aquatic plants stay in when submersed in an aquarium) a potassium boost is not needed, although no harm is done in boosting potassium levels a little, even if no plants are flowering. The “vegetative state” is basically where all the growing and bulking up of the plant is done, and from our experience, most (not all) aquatic plants will only flower and leave the vegetative state and merge into the flowering/reproductive stage when grown out of water or when they hit the surface of the aquarium and become exposed to the open air.

Function of Calcium: “Calcium is responsible for holding together the cell walls of plants. Deficiency: When calcium is deficient, new tissue such as root tips, young leaves, and shoot tips often exhibit distorted growth from improper cell wall formation” (Troy Buechel, 2016).  When a leaf starts to distort, it can often twist, stay small, as in become stunted, and also look a little frilly or wavy on some species.

Function of magnesium: “Many enzymes in plant cells require magnesium in order to perform properly. However, the most important role of magnesium is as the central atom in the chlorophyll molecule. Chlorophyll is the pigment that gives plants their green colour and carries out the process of photosynthesis. It also aids in the activation of many plant enzymes needed for growth and contributes to protein synthesis. Deficiency: Magnesium is mobile within the plant so deficiency symptoms appear first in older leaves. The symptoms show up as yellow leaves with green veins (i.e. interveinal chlorosis)” (Retrieved from, 2017).

Deficiency Chart

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